Many thanks to Caleb Nelson for alerting me to a Joseph Williams interiew by Vicki Abelson that you can see on YouTube:
This is actually from last June, but it ties in nicely with the publicity for the upcoming John Williams documentary. Joseph talks about his childhood with John as his dad, about his late mother Barbara Ruick, his time singing for the band TOTO, composing TV music alongside Snuffy Walden, and much more. A lot of funny stories. Very illuminating!